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From: "Yicong Yang" <yang.yicong@picoheart.com>
To: <pjw@kernel.org>, <palmer@dabbelt.com>, <aou@eecs.berkeley.edu>,
	 <linux-riscv@lists.infradead.org>
Cc: <wangruikang@iscas.ac.cn>, <ganboing@gmail.com>, <alex@ghiti.fr>,
	 <andrew.jones@oss.qualcomm.com>, <cleger@meta.com>,
	 <geshijian@picoheart.com>, <niehaitao@picoheart.com>,
	 <cuiyunhui@bytedance.com>, <yang.yicong@picoheart.com>
Subject: [PATCH v3 2/5] riscv: insn: Support decoding of CBO instructions
Date: Mon,  7 Sep 2026 15:21:46 +0800	[thread overview]
Message-ID: <20260907072149.72031-3-yang.yicong@picoheart.com> (raw)
In-Reply-To: <20260907072149.72031-1-yang.yicong@picoheart.com>

Add definitions for decoding CBO instructions. Rename
RVG_OPCODE_FENCE to RVG_OPCODE_MISC_MEM as spec defines
it as MISC-MEM and it's also used by CBO instructions.

Signed-off-by: Yicong Yang <yang.yicong@picoheart.com>
---
 arch/riscv/include/asm/insn.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/insn.h b/arch/riscv/include/asm/insn.h
index c36d1dfa16c6..f6b32d8d558d 100644
--- a/arch/riscv/include/asm/insn.h
+++ b/arch/riscv/include/asm/insn.h
@@ -12,6 +12,7 @@
 #define RV_INSN_FUNCT3_OPOFF	12
 #define RV_INSN_OPCODE_MASK	GENMASK(6, 0)
 #define RV_INSN_OPCODE_OPOFF	0
+#define RV_INSN_FUNCT12_MASK	GENMASK(31, 20)
 #define RV_INSN_FUNCT12_OPOFF	20
 
 #define RV_ENCODE_FUNCT3(f_)	(RVG_FUNCT3_##f_ << RV_INSN_FUNCT3_OPOFF)
@@ -135,7 +136,7 @@
 #define RVC_C2_RS1_MASK		GENMASK(4, 0)
 
 /* parts of opcode for RVG*/
-#define RVG_OPCODE_FENCE	0x0f
+#define RVG_OPCODE_MISC_MEM	0x0f
 #define RVG_OPCODE_AUIPC	0x17
 #define RVG_OPCODE_BRANCH	0x63
 #define RVG_OPCODE_JALR		0x67
@@ -171,6 +172,7 @@
 #define RVG_FUNCT3_JALR		0x0
 #define RVG_FUNCT3_BEQ		0x0
 #define RVG_FUNCT3_BNE		0x1
+#define RVG_FUNCT3_CBO		0x2
 #define RVG_FUNCT3_BLT		0x4
 #define RVG_FUNCT3_BGE		0x5
 #define RVG_FUNCT3_BLTU		0x6
@@ -186,12 +188,14 @@
 #define RVC_FUNCT4_C_EBREAK	0x9
 
 #define RVG_FUNCT12_EBREAK	0x1
+#define RVG_FUNCT12_CBO_CLEAN	0x1
+#define RVG_FUNCT12_CBO_FLUSH	0x2
 #define RVG_FUNCT12_SRET	0x102
 
 #define RVG_MATCH_AUIPC		(RVG_OPCODE_AUIPC)
 #define RVG_MATCH_JALR		(RV_ENCODE_FUNCT3(JALR) | RVG_OPCODE_JALR)
 #define RVG_MATCH_JAL		(RVG_OPCODE_JAL)
-#define RVG_MATCH_FENCE		(RVG_OPCODE_FENCE)
+#define RVG_MATCH_FENCE		(RVG_OPCODE_MISC_MEM)
 #define RVG_MATCH_BEQ		(RV_ENCODE_FUNCT3(BEQ) | RVG_OPCODE_BRANCH)
 #define RVG_MATCH_BNE		(RV_ENCODE_FUNCT3(BNE) | RVG_OPCODE_BRANCH)
 #define RVG_MATCH_BLT		(RV_ENCODE_FUNCT3(BLT) | RVG_OPCODE_BRANCH)
-- 
2.50.1 (Apple Git-155)

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  parent reply	other threads:[~2026-09-07  7:22 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-07  7:21 [PATCH v3 0/5] Add workarounds for Picoheart erratas Yicong Yang
2026-09-07  7:21 ` [PATCH v3 1/5] riscv: Make get_insn public for instruction fault handling Yicong Yang
2026-09-07  7:21 ` Yicong Yang [this message]
2026-09-07  7:21 ` [PATCH v3 3/5] riscv: errata: Add init framework for picoheart errata Yicong Yang
2026-09-07  7:21 ` [PATCH v3 4/5] riscv: errata: picoheart: Add workaround for cbo.clean errata Yicong Yang
2026-09-07  7:21 ` [PATCH v3 5/5] riscv: errata: picoheart: Add workaround for AMOCASQ errata Yicong Yang
2026-09-07 15:44   ` Conor Dooley
2026-09-08 11:41     ` Yicong Yang
2026-09-08 13:27       ` Conor Dooley
2026-09-08 14:28         ` Yicong Yang

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